Heat transfer and flow characteristics in a pipe in which the rotating cutting tool for boring a underground pipe without digging were considered in this study. The amount of heat generation due to the friction between the rotating cutter and pipe wall, mixing flow of air and water injected to cool down are the two important factors to design the boring machine. Computational fluid dynamics analysis using the Eulerian mixture model and the standard k-ε turbulence model was used to analyze the complex phenomena in a pipe during the process. Results show that pipe wall temperature decreased with increasing the cooling water inlet velocity. It is also shown that pipe wall temperature was lowered when the cutter rotation speed was increased until 600 rpm. There was no further cooling effect over 600 rpm.

• 박영기(익산대학 건설환경시스템과) | Young Ki Park Corresponding Author
• 이장춘(익산대학 건설환경시스템과) | Jang Choon Lee
• 이동주(군산대학교 토목환경공학부) | Dong Joo Lee